Study on deformation regularity and stability analysis of bedding rock slope in secondary excavation

Abstract

The study on the regularity and stability of rocky slope under secondary excavation can provide an optimization for the design parameters of slope support in highway reconstruction and expansion project. Based on the widening project of Laiwu--Linnyi section of Beijing-Shanghai expressway, in order to obtain the deformation law of the rock slope under the second excavation, finite element software was used to analyze the safety factor, displacement field and stress field. The result shows that (1) the vertical and horizontal displacement of both the existing slope surface and the new slope face had an increasing trend under the second-stage excavation, and the vertical displacement increment in the middle of slope is obvious; (2)The toe of slope is the area where shear stress is concentrated, Shear failure occurs and tensile stress exists on the slope roof;(3)Interface and exposed area of rock strata have strongly bedding sliding trend during the second excavation, which should be protected and monitored. The results can provide technical support for engineering construction and provide references for similar projects.